.flex_auto() {
  -webkit-box-flex: 1;
  -ms-flex: auto;
  -webkit-flex: auto;
  flex: auto;
}
.flex-direction_column {
  -webkit-box-orient: vertical;
  -ms-flex-direction: column;
  -webkit-flex-direction: column;
  flex-direction: column;
}
.display_flex {
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
}
